Fixing and buying guide
EARTHWOOL GLASS MINERAL WOOL DRITHERM 32 ULTIMATE 1200 X 455 X 125mm (4) - 2.184mtr sq
What this product is and who it is for
Dritherm 32 Ultimate is a premium cavity wall insulation made from glass mineral wool. It is designed for builders, contractors, and experienced DIY installers working on residential and commercial cavity wall projects. The product is particularly suited to new build properties and renovation work where cavity widths accommodate the 125mm thickness. It delivers thermal performance whilst meeting building regulations for fire safety.
- Glass mineral wool cavity wall insulation
- Suitable for standard cavity widths
- Ideal for new build and renovation applications
- Meets UK building regulations for thermal and fire performance
Pack contents and coverage
This pack contains four individual batts, each measuring 1200 x 455 x 125mm. The total coverage is 2.184 square metres, making it suitable for insulating a defined cavity wall area. The batts are designed to fit between cavity ties and wall ties in standard masonry construction, with the 455mm width fitting typical cavity spacings.
- Four batts per pack
- Each batt: 1200 x 455 x 125mm
- Total coverage: 2.184 square metres
- 125mm thickness for standard cavity widths
Compatibility and installation checks
Before purchasing, confirm your cavity width accommodates 125mm insulation and that cavity ties are in place at appropriate centres. The product is compatible with masonry outer and inner leaves. Ensure the cavity is clear of debris and mortar droppings, and that damp-proof courses are properly installed. The batts should be fitted snugly between cavity ties without compression, maintaining their thermal performance.
- Verify cavity width is suitable for 125mm thickness
- Check cavity ties are present and correctly spaced
- Clear cavity of debris and mortar before installation
- Confirm DPC installation is complete
- Do not compress batts during fitting
Preparation and fixing
Dritherm 32 Ultimate batts are placed within the cavity and held in position by cavity ties as the inner leaf is built. No additional fixings are required. Ensure batts are butted tightly together to eliminate gaps that would reduce thermal performance. Work methodically from the base upwards, checking alignment as you progress. The product should be kept dry before and during installation.
- Position batts between cavity ties as inner leaf is constructed
- Butt batts tightly together to eliminate thermal bridging
- Work from base upwards in systematic rows
- Keep product dry before and during installation
- No additional fixings needed